GoogleOSV:GHSA-FJ6F-6933-839JNon-constant time HMAC comparison
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
3.5 Low
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:S/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
49.3%
Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not use a constant-time comparison when checking whether two HMACs are equal. This could potentially allow attackers to use statistical methods to obtain a valid HMAC for an attacker-controlled input value.
Jenkins 2.219, LTS 2.204.2 now uses a constant-time comparison when validating HMACs.
References
www.openwall.com/lists/oss-security/2020/01/29/1
access.redhat.com/errata/RHBA-2020:0402
access.redhat.com/errata/RHBA-2020:0675
access.redhat.com/errata/RHSA-2020:0681
access.redhat.com/errata/RHSA-2020:0683
github.com/jenkinsci/jenkins
github.com/jenkinsci/jenkins/commit/6f35dbb939ebe947bdb1979010b208480f1d0e31
jenkins.io/security/advisory/2020-01-29/#SECURITY-1660
nvd.nist.gov/vuln/detail/CVE-2020-2102
Related
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
3.5 Low
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:S/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
49.3%